Voldenuit, I appreciate your very detailed and considered response. It is clear you spent a fair bit of time on my photos and I am grateful.
First, let me be clear. I am very new to photography. 5 years at the most (although I have been a dabbler for a much longer time). Your telling me that I am not always successful is far from presumptuous. While I don't like personal attacks, I am very open to criticism.
Having given freely of your time, I am hesitant to ask, but if you have a moment I would be pleased if you can cut and paste your comment into my site wherever suits you best. Perhaps the guestbook for the 365 project? I'd like to preserve it as part of the site so it becomes a bit easier to refer back to it.
I use the K7 and previously used the K10D. I warmed to the K7 in a way that I never warmed to the K10D, it fits better in my hand, the controls seem to be more attuned to the way I take photos and the picture quality is as good as I need. I shoot exclusively in RAW (Adobe Digital Negatives) as I don't need the speed or convenience of JPEGs and I like the latitude that RAWs give me in processing.
I've seen the discussions regarding the supposed superior output at high ISO of the K-X, but I've never used it, so I would hesitate to give an opinion. As it is I am satisfied with the output of the K7 up to ISO1600. For me, it is a matter of choices. I wouldn't use ISO1600 to take a photo of foliage with a lot of detail. I'd use it at night when I shoot handheld (I expect, and like a bit of grain).
In the largest print I've made from the K7, 20x30, the quality has been good. For a technical purist I suppose the output must be perfect in every way. Maybe if I ever go commercial I'd want more.
As far as lens go, I have no references as I've never used any other system. But I certainly think that Pentax glass is as good as anyone else's. I've got a couple of gems, the 31mm ltd and the 43mm ltd. Each of them is amazing in its own way, but I love the rendering of the 43.
For an extended period the 31 was the only lens I used. It sees the way I see. But the rendering of the 43 is magical at times.
These days I use 2 zooms almost exclusively DA*16-50 and DA 55-300). I walk in some bad areas and it doesn't do to stand still for too long changing lenses
Besides I've formed a sentimental attachment to the 31 and the 43 and, although I have insurance, I wouldn't want to lose them.
I bought the K10D (and into the Pentax K-mount) because when I researched digital SLRs I did it as a computer geek and looked for the best value for money. Knowing what I now know, I might have made a different choice. But I don't really regret it.